Apparatus for coating objects with subdivided material.



F. F. BRADLEY. APPARATUS FOR COATING OBJECTS WITH SUBDIV'IDBD MATERIAL.

APPLICATION rum) FEB. 11,1916.

Patented July 29, 1913.

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-- -not wish to be li i to ST T OFFICE-- IIRANIKLIN r. BRADLEY, orcnrcneo, ILLINOIS, ASSIGNOB, '10 BRAIbLEr AND vnoom conramr, or onrcaeo, rumors, A coaronmiron or rumors.

- rnrrenaros FOR coerrne 0mm wr'rn- SUBDIVIQDIED m'rnnran.

To all :uihom it mag c ans e m:

-Be it known thatI, FRANKLIN F. BRAD- mr, citizen of the United States,-r esiding'at -Ch1cag0,,1 n the county of Cook and State of fi 'lllinoiahaveinvented a certain new and 4 useful Improvement 1n Apparatus for Coat- Objects with subdivided Material, of

i which the following is a full, clear, concise,

andfexact description, reference being bad part of'thisspecification- My invention relates to apparatus for coating objects with com'minuted, subdivided or powdered material and is of particular orgpainted with suitable adhesive material .or paint which in its fresh state holds-the powder scattered thereuponand in' its dry state firmlyfixes' the powder'inplace;

, In practising my invention, I employ a receptacle for-containing the object that'is to be coated .with the powdered material, a fan .aiiithrough 'the recep 'P P Which-d9 A sirably includes the blower and receptacle Qin serial relation to establish a closed local path or circuit for the' circulating air, though I do this way of practw ns y i ve t J I provide means for altering the locality where the 'air has fullest flow for the purpose of modifying the direction of theair within the receptacle, to convey the material with which the air is laden to exposed parts of the object that are to receive the coating- In one embodiment of the invention the re-- *sult last described issecured bymeans of moving elements such-as valves to permit the preferably located in'a wall of thereceptacle, Whereby'the. localitywhere air 1s initlally impressed upon air within the receptacle 1s facing the air entrances. The airis. de-

sirably also caused to leavethe receptacle to the accompanying drawings, form ng a.

service in'spreading bronze powder upon ob-. ects whose surfaces to be'coated are covered.

or blower for effecting forced circulation of.

openingand closing ofa number of openings distributed over an area substantially co extensive with the largest area to be coated wlththe powder, tozins'ure the accessof the powder to the largest-surface that may be exposed thereto.- In the preferred embodiment of the invent-ion, the aggregate area of the' air exit openingsdoes not exceed the area in right cross section of the piping conveylng the air from the receptacle so that the powder laden air is forced to seek all that space within the receptaclewhere the objects to be coated with powder are properly located. In'the preferred embodiment of. the invention, the exit openings are afforded by meansof a'screen or perforated .plate located in front of the exit are distributed over the desired area.

I wlllexpla n my" invention more fully by Specification of Letters Batent. I Patented J uly 293191 3. I f Application filed February '11,' 191o. Serial No.'543,215.

through a plurality of exit openings that are reference to the accompanying drawing showing the preferred embodiment thereof and in which. I a Figure 1 is'an elevation, partly'in section, of such preferred embodiment; Fig. 2 is a sectional view 'inthe direction of arrows 2 2 in Fig. 1; and Fig. 3 is a sectional view in"- the direction of arrows 3 3 in Fig. 1.

Lilge part's'are indicatedby similar characters of reference throughout the different figures. v I

r The receptacle a is shaped'suitablyto theobjects to be received'therein, theconstruction illustrated being well adapted 'to receive metal bedstead partsthat are moved into and out of the receptacle upon a truck I) through a doorwayc, a bedstead part (Z being illustrated within the receptacle. The doorway constitutes an opening through which the ob jects to be coated may be passed into the re ceptacle interior in position to enable the air to be circulated around and tow-ard the objects, and the door cconstitutes a closure for said opening for preventing escape of material laden air therethrough while the ob-.

jects are being coated. A section a of suitable piping leads fromthe air exit side of the receptacle to. a power driven fan or blower f, the complemental section g of'the piping leading from the blower to the air entrance side of the receptacle located'opposite the air exit side,the pipe section 9 having multipled branchesh 'aifording multipled discharge openings through which air is admitted to theinterior of the receptacle.-

conduit 2', said conduit inclosing a power driven feeding worm is for forcing the powder through an opening at the bottom of the conduit which establishes communication be tween the interiors of the piping and the conduit. The object to be coated is located in substantial alinement with the entrance and exit openings. I

The powder is thoroughly and evenly distributed throughout the flowing column of movin air. to the multipled dis chargee'nds Z m oi: the piping that may be located'in vertical alinement. These 'multipled pipe ends flare toward the interior of the recep tacle a, valves 7? 0 being located in the throat portions of said pipe ends. By l naf nipulation of these valves, the powder laden air may be caused to pass entirely through each of the discharge ends in succession, wvhereby the place where the air enters the receptacle is changed with respectto the object to be coated and the air is preferablycaused rapidly to swirl within the receptacle so that it may carry the powder not only to those surfaces of the structure saidstructure. By the mechanism described, the locality where air is initially impressed upon a1r within the receptacle is changed for the purpose stated. The

powder are'eoated or painted with a suit-- able material or paint, which, in its wet state, holds the powder, and thereafter in its dry state, prevents its dislodgment. Further to insure the carriage of the powder to all surfaces upon which it is to be lodged, and to improve the swirling action of the air fOitlllS purpose I also multiple the air exit openings and distribute them over an area that preferably exceeds the larg'estopposed surface upon the structure cl that is to receive the powder. Thesemultipled air exit or discharge openings are desirably consti tuted of the perforations p in a screen plate Q preferably constifiiitin'g a walhof the re- The aggregate area of these ceptacle a. 'screenopenings 15' prefera-Bly not greater 5 than the area of a right'cross section air in the piping and is conveyed by the (Z that are immediately in front of the dis-- charge openings, but to all other-exposed surfaces of said object as well, including v those at the top, bottom, ends and backs of" through the portion of the' "pi e '6 that is uniform in diameter, the escaping'airpassing through alllof the openin s pin seeking paths of least resistance. T e endof the pipe section e adjacent to the screen 9 flares toward said screen and embraces its borders. The entire-structure is such that the air" is caused to flow in a-general movementnnd in varying eddies and minor currents.

The structure Z mayremaindn the re, 75 ceptacle. more than a suflicient length of time required to eoatit with thepowder, as the adhesive material will only holdwhat powder is properly required to coat I the structure. The powder that does-notlt o adhere to the structure cl continues to circulate through the-closed afir circuit which I has been described as long asthe fan or blower remainsin action, and the amount which becomes lodged upon said structuref35 is. replenished at A slight excess of powder may remain'upon the structure d after its removal from thereceptacle and which isof coursedislodged as by a brush.

i I have herein shown and particularly de "9 scribed the preferred embodiment -of myinvention, to which, however, I do notwish to be limited,-as changes may readily be" made without departing from the spirit of my invention." V v Having thus described my" invention, 1" claim as new and desire to secure by Letters Patent the 'following:-

1. Apparatus. for coating objects with subdivided material carried by air, including'a receptacle for the objects; mechanism for forcing passage of air within the rceptacle, there being an element having plurality of openings incommunication with the receptacle" interior and through; which the air is forced; and mechanism! for permitting and cutting off flow ofair through said openings to cause the LllI'QC -H tion of the airto be changed within the rev ceptacle, there being also a plurality of distributed openings supplied in addition to the aforesaid openings and affording communication between the exteriorof the a receptacle and its interior and located to v have the object to be coated placed between ..'115 the same and the first aforesaidopenings, said second set of 'openings causing spread-,. ing of the material laden air, the air in being spread and having its direction changed carrying the material with which it'is; laden 1-20 to the surfaces of the object that are to be coated therewith. g

Apparatus for coating objects with subdivided material, carried byiair, including a receptacle for the objects; mechanism for forcing passage of air within the recep- I tacle, there being an element through which the air is'forced; and mechanism whereby i the locality where the airv has fullest flow 1 between said elementand receptacle maybe I changed thereby to cause the direction of the an" to be changed within the receptacle,

there being also a plurality of openings zit-- fording communication between the exterior aforesaid element has communication with terial with which it is laden to the surfaces the material with which the air is laden to there the receptacle interior, said plurality of openings causing spreading of the material laden air, theair in being spread and hav-- ing its direction. changed carrying the ma- .of the object that are'to be coated therewith.

divided material carried by receptacle for the objects; forcin air, including a mechanism for passage of air within the receptacle,

ofopenings in communication with the receptacle nterior and through which the air is forced; and mechanism for permitting.

and cutting ofi flowof air through said openings to cause the direction of the air to be changed within the receptacle to convey exposed parts ofthe object that are to receive the coating.; 7 p v.

4. Apparatus for-coating objects with sub.-

- divided materialcarriedby air, including a receptacle for the objects; mechanism 'or divided material carried by air;- including a 60.

forcing passage of air within the receptacle; andmechanism whereby the locality where the air hasfullest flow may be changed thereby to cause the direction of the air to be changed within the receptacle to convey the materialwith which the air is laden to exposed parts of the object that are .to receive the coating. I

5. Apparatus for'coatingobjects with subdivided material carried by air, including a receptacle having entrance and exit openings for the air between which the object to be coatedmay be placed 'in substantial 'ali'nement therewith; mechanism for efiect-' ing forced passage of air through said openings and the interior of'the receptacle; and mechanism for 'ettecting relative change between the object to be coated and a locality where air finds passage between the interior.-

and exterior of. the receptacle whereby the .di-rection of air withrespect to said objectis changed-to enable the material with which the air is laden to'be carriedto exposed parts of the object that are to be coated there- With. i v 3 6. Apparatus'for coating objects with sub-' receptaclefor the object having two localities fpr establishing communicationbetween the receptacle interior and exterio'r'and bes may be placed,theIstructure' at locali tween which localities the object tobe coated 3. Apparatus for coating-objects with subeing an element; having a plurality as comparec'l with the area through which theair fin s passage between the receptacle and mechanism for forcing the passage of material laden a r through from one of said localities to the other.

to convey the material with which the air is laden to exposed parts of the object that are to receive the coating. 8. Apparatus for coating objects with suba receptacle for the objects; mechanism for and mechanism whereby the locality where air is. initially impressed upon air within thereceptacle is changed, thereby tolcause the direction of the air to bechangedwithin the receptacle to convey the material with which the airis laden to exposed parts of the "object that'are to receive the coating, the receptacle having an opening throughwhich the objects to be coated may be passed into the receptacle interiorin position to enable the air to be circulated around and toward the objects and a. closure for said openin for preventing escape of' material ladenalr therethroughwhile the objects are being coated. j

' 9. Apparatus for coat-in objects with subdivided material carried y air, including a receptacle havin anopening. through which the objects to be coated may be passed into the receptacle interior in posit on to enable-the airto becirculated around and toward the objects and a closure for said opening for preventing escape of' material laden alr therethrough while the objects are being coated; and mechanism for causing the material laden air to be directed around and toward theobjccts in a general more ment "and in eddiesand minor currents to convey'the material with which the air is laden to exposed parts of the objects that are to receive'the coating; I

10.Appa ratus .for coating objects with subdivided material carried by air. including a receptacle for'the objects; mechanism for forcing passage of air within the receptacle; ai' d'mechanism whereby thelocality where the air has fullest flow may be changed tlierebyto cause the direction of the air to ,"be changed within the receptacle to convey "thematerial withwhich ,the air is laden to exposed parts of the object that are to receive3theicoatin'g, the receptacle having an interior and exterior at the other locality,

the receptacle air within the receptaclef changed thereby to cause the direction oii the air to be changed within the] receptacle divided material carrier by air, including forcing passage ofair, within the receptacle,-

7. Apparatus forcoating objects with sub- 15 v prising a closed chamber for holding a body opening through which the objects to be coated may be passed into the receptacle interior in position to enable the air to be circulated around'and toward the objects and a closure for said Opening for preventing escapeof material laden air therethrough while'the objects are being coated.

11.. A machine of the kind specified, com- I prising a closed chamber for holding a body of ai r laden-"with coating material and adapted to receive articles 'to' be coated,

means'for creating air currents in said chamber, and means for varying the direction of travel of said air currents. 12. A machine of the kind specified, comof air laden with cbating material, and

adapted to receive articles to be coated, means for creating air currents in said chamber, and means for varying the direction of travel of said air currents relatively to the article to be coated to cause the same to impinge. upon oppositely disposed surfaces thereof.

' FRANKLIN F. BRADLEY.

l Vitnesses:

G. L. CRAGG, R. E. ATHERTON. 

